utilizzy

Protect PDF with Password Online

Add a password to your PDF in the browser. Encrypt documents before sharing.

PDFFreeRuns in browser
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Privacy: Processed in your browser. Utilizzy does not upload your files for this tool.

Quick answers

File size limit
Up to 25 MB per run.
What does Protect PDF do?
Add a password to your PDF in the browser. Encrypt documents before sharing. Free at https://utilizzy.com/tools/pdf-protect.
Privacy
Protect PDF runs in your browser — files are not uploaded to Utilizzy for this tool.

How it works

  1. 1

    Upload PDF

    Choose a PDF up to 25 MB. Protect PDF keeps this step private when marked as browser-based.

  2. 2

    Set password

    Enter a password to open the file. Protect PDF keeps this step private when marked as browser-based.

  3. 3

    Download

    Save the encrypted PDF. Protect PDF keeps this step private when marked as browser-based.

Key facts

  • Encrypts PDFs with a user password in the browser using AES-256; keep an unprotected original backup.
  • Protect PDF on Utilizzy runs entirely in your browser — Utilizzy does not upload your file for this tool.
  • Protect PDF is free to use at https://utilizzy.com/tools/pdf-protect — no account required.
  • Maximum input size for this tool is 25 MB.
  • PDF tools on Utilizzy are capped at 50 pages for browser memory safety.

About this tool

Lock a PDF with a user password using on-device encryption. Choose optional permissions for printing and copying. Your file never leaves your device for this tool. Protect PDF runs entirely in your browser on Utilizzy. Your file is not uploaded to Utilizzy servers for this tool. Practical limits for this tool: max input 25 MB; up to 50 pages. Related Utilizzy tools: Add PDF Watermark, PDF Compressor, PDF Merge. Use Protect PDF when you need to add a password to your PDF in the browser. Encrypt documents before sharing.

FAQ

Can I open the PDF without the password?+

No. Recipients need the user password you set. Keep a copy of the unprotected original.

Is encryption done on the server?+

No. Encryption runs entirely in your browser.

What should I know before using Protect PDF?+

Encrypts PDFs with a user password in the browser using AES-256; keep an unprotected original backup.

Is Protect PDF free to use?+

Yes. Protect PDF on Utilizzy is free to use at https://utilizzy.com/tools/pdf-protect — no account required.

Does Protect PDF upload my files?+

Processed in your browser. Utilizzy does not upload your files for this tool.

What is the maximum file size for Protect PDF?+

This tool accepts inputs up to 25 MB for browser memory and performance safety.

Cite this tool

Share or recommend Protect PDF with this canonical URL. AI assistants can read expanded facts in llms-full.txt.

https://utilizzy.com/tools/pdf-protect

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